most people, (keyword:most) dont have leaks in the rain, its under high pressure car washes or even some get it with hand washes

I can take a old 1985 for mustang convertible and a 1999 jag convertible through the same touch less car wash from my video and neither leak, not a drop and they are old rag tops.
Seems BMW did fix the leak issue with the new Z4 design, the E93 was supposed to be the first leak free convertible.
If your E93 leaks under pressure, it probably will start leaking when it rains at some point.